The next morning Jenny woke up still sitting in the stall. With shaking hands she checks to see if the tail and ears were real or just some terrible nightmare. When she find that they are real she muffles a sob and stands up slowly walking out of the stall. Before she makes it half way something hits her hard from behind and she falls forward back over the bail of straw sitting in the stall. Cursing she starts to get back up but the pony is faster and is on her in a second. She screams as she feels its cock slid back up her wet tunnel. After a second the pony begins punping away at her and the fear and anger is washed away in waves of orgasms. With each orgasm something else on her body changes. First her feet turn into hooves, then she grows soft, short brown hair all over her body, then her face grows out into a small horse-like muzzle. Slowly she totally changes until she is totally a pony-girl.
By this time all she can think about is sex and wanting more of it. She pushes the pony off her and rolls over then guides his cock back into her pussy and begins to buck with him crying out with pleasure as it slides in and out. After several minutes the pony blows another load of cum into her womb and her stomach swells out to look like she is at least 9 months pregnant. As he pulls out of her she moans and begins fingering herself eager for more, scooping up the cum as it leaks out of her and licking it off her fingers.
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Cynthia and Randall are standing in the kitchen watching as the final transformation happens to the pony-girl Jenny.
"Excelent" says Randall
"What will happen to her now, uncle?"
"She should give birth soon, then now that her transformation is finished she will find that the Pony can no longer fully satisfy her needs. I am the only one who can do that now. I will breed her like I would any other mare only being able to impregnate her my self will be so much more enjoyable" he says with a laugh. "Take her to the lab before she goes into labor. It should be anytime now."
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As Jenny lays there fingering herself Cynthia walks in. "Come with me Jenny" she commands
Jenny slowly gets up and wobbles after Cynthia on her new hooves trying to keep up. Cynthia leads Jenny down some stairs into a lab then pointing to a maternaty table she orders Jenny to lay down then straps her in place. About an hour later Jenny gives birth to 2 little Pony-girls.